HORIZON PROJECT

# vary

[![NPM Version][npm-image]][npm-url]

[![NPM Downloads][downloads-image]][downloads-url]

[![Node.js Version][node-version-image]][node-version-url]

[![Build Status][travis-image]][travis-url]

[![Test Coverage][coveralls-image]][coveralls-url]

Manipulate the HTTP Vary header

## Installation

This is a [Node.js](https://nodejs.org/en/) module available through the

[npm registry](https://www.npmjs.com/). Installation is done using the

[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally): 

```sh

$ npm install vary

```

## API

<!-- eslint-disable no-unused-vars -->

```js

var vary = require('vary')

```

### vary(res, field)

Adds the given header `field` to the `Vary` response header of `res`.

This can be a string of a single field, a string of a valid `Vary`

header, or an array of multiple fields.

This will append the header if not already listed, otherwise leaves

it listed in the current location.

<!-- eslint-disable no-undef -->

```js

// Append "Origin" to the Vary header of the response

vary(res, 'Origin')

```

### vary.append(header, field)

Adds the given header `field` to the `Vary` response header string `header`.

This can be a string of a single field, a string of a valid `Vary` header,

or an array of multiple fields.

This will append the header if not already listed, otherwise leaves

it listed in the current location. The new header string is returned.

<!-- eslint-disable no-undef -->

```js

// Get header string appending "Origin" to "Accept, User-Agent"

vary.append('Accept, User-Agent', 'Origin')

```

## Examples

### Updating the Vary header when content is based on it

```js

var http = require('http')

var vary = require('vary')

http.createServer(function onRequest (req, res) {

  // about to user-agent sniff

  vary(res, 'User-Agent')

  var ua = req.headers['user-agent'] || ''

  var isMobile = /mobi|android|touch|mini/i.test(ua)

  // serve site, depending on isMobile

  res.setHeader('Content-Type', 'text/html')

  res.end('You are (probably) ' + (isMobile ? '' : 'not ') + 'a mobile user')

})

```

## Testing

```sh

$ npm test

```

## License

[MIT](LICENSE)

[npm-image]: https://img.shields.io/npm/v/vary.svg

[npm-url]: https://npmjs.org/package/vary

[node-version-image]: https://img.shields.io/node/v/vary.svg

[node-version-url]: https://nodejs.org/en/download

[travis-image]: https://img.shields.io/travis/jshttp/vary/master.svg

[travis-url]: https://travis-ci.org/jshttp/vary

[coveralls-image]: https://img.shields.io/coveralls/jshttp/vary/master.svg

[coveralls-url]: https://coveralls.io/r/jshttp/vary

[downloads-image]: https://img.shields.io/npm/dm/vary.svg

[downloads-url]: https://npmjs.org/package/vary